Hammer



FIG. 1 is a top, rear, right-side perspective view of a hammer;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is a bottom, rear, right-side perspective view thereof; and,

FIG. 6 is a bottom, rear, left-side perspective view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a hammer, as shown and described. 